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ANALYTIC SCIENCES CORP READING MA

Overview
Works: 132 works in 140 publications in 1 language and 144 library holdings
Publication Timeline
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Most widely held works by ANALYTIC SCIENCES CORP READING MA
TASC ASTT Technical and Management Monthly Progress Report( )

5 editions published between 1997 and 1998 in English and held by 5 WorldCat member libraries worldwide

This report provides a summary of the progress made during the report period under TASC's three ASTT (Advanced Simulation Technology Thrust) projects: (1) MRA (Multiresolution Analysis), CLIN 0001/0002, Whitney; (2) JETS (JSIMS Environmental Tailoring), CLIN 0003/0004, Ouzts; (3) FROST (Framework of Reusable Objects), CLIN 0005/0006, Stanzione. This report contains both Technical (Section 2) and Management/Financial (Section 3) status information, reported individually for each of the three projects
Military Geodesy and Geospace Science Unit One by W. G Heller( Book )

4 editions published in 1981 in English and held by 4 WorldCat member libraries worldwide

This lecture course provides a full-year introduction to Military Geodesy and Geospace Science. Throughout the presentation a military perspective is maintained which links Mapping, Charting, and Geodesy (MC & G) issues with modern defense requirements. Elementary preparation is assumed in the subjects of general physics, mechanics, chemistry, astronautics, and linear system theory. The student should also be familiar with differential equations, analytic geometry, and linear algebra. Some acquaintance with vector calculus is useful but not essential. The topics covered herein are intended to provide conceptual rather than working knowledge. Ideally, the student completing this course will have attained a broad understanding of the MC & G field and will be able to develop specialized expertise quickly when required. The notes are intended to be presented in chapter/section order within each of the four Units of Instruction. However, several of the subsections in these notes contain more advanced material which may be omitted without loss of continuity. These subsections are denoted with the symbol (+) after the title. A fifth volume contains faculty material. The organizational flow of the lectures is from concepts in the initial sections, particularly in Unit One, to applications and specific systems later on. As a result the student is often referred ahead to provide motivation in regard to relevancy. In later chapters, however, the situation is reversed with the student referred back to review important conceptual material as necessary. (Author)
Risk Management Concepts and Guidance( )

1 edition published in 1989 in English and held by 2 WorldCat member libraries worldwide

This guide updates and expands the Defense Systems Management College's 1983 Risk Assessment Techniques Guide. This version was developed in response to the 1986 Government Accounting Office (GAO) report on DOD efforts relative to real assessments. In addition to technical risk, this guide addresses cost risk, schedule risk, programmatic risk, and supportability risk. There are no textbook answers to risk management. Each situation is different and requires a slightly different approach. This guide is designed to be used as an aid in classroom instruction and as a reference book for practical application. It is for use by all levels of program managers and designated risk analysts. Keywords: Risk assessment; Risk planning; Risk analysis; Risk handling
Military Geodesy and Geospace Science Faculty Material by W. G Heller( Book )

1 edition published in 1981 in English and held by 2 WorldCat member libraries worldwide

This document provides a lecture course outline for a full-year introduction to military geodesy and geospace science. Throughout the presentation a military perspective is maintained which links mapping, charting, and geodesy (MC & G) issues with modern defense requirements. Elementary preparation is assumed in the subjects of general physics, mechanics, chemistry, astronautics, and linear system theory. The student should also be familiar with differential equations, analytic geometry, and linear algebra. Some acquaintance with vector calculus is useful but not essential. The topics covered are intended to provide conceptual rather than working knowledge. Ideally, the student completing this course will have attained a broad understanding of the MC & G field and will be able to develop specialized expertise quickly when required
Visual Information Environment Prototype (VIEP) by Steven L Rohall( Book )

2 editions published in 1998 in English and held by 2 WorldCat member libraries worldwide

This report contains information from the work performed under the visual information environment prototype (VIEP) contract to evaluate and integrate technologies to perform collaborative functions involving several different sites, over high speed communication links, and using advanced human-computer interfaces (HCI). A demonstration system was developed to showcase collaborative multimedia technologies in a next-generation C4I scenario, utilizing advanced display and HCI technology
Development of Loran-C data collection and analysis procedures by Leon M DePalma( Book )

1 edition published in 1980 in English and held by 2 WorldCat member libraries worldwide

A unified data collection and analysis plan to support NAFEC and the FAA in the assessment of Loran-C as either a replacement for or supplement to the current network of VOR/DMEs is presented. This effort focused on four specific areas: Developing mathematical models of temporal variations in Loran-C signal phase and amplitude; Developing data collection procedures to enable an assessment of the accuracy and adequacy of proposed models; Defining a data analysis plan that will enable maximum use of the data collected in identifying parameters of the proposed models and cause and effect relationships of Loran-C temporal variations; and Defining a plan for the design of a data management system for the storage and maintenance of collected data and an efficient interface for the data analysis programs. The plans and models provide the necessary structure for the data collection and analysis effort anticipated to commence early in 1980. Subsequent analysis of the Loran-C data will validate the models and dictate any modifications of the plans
Loran-C Grid Calibration Requirements for Aircraft Non-Precision Approach by Leon M DePalma( Book )

1 edition published in 1982 in English and held by 2 WorldCat member libraries worldwide

The Federal Aviation Administration (FAA) Technical Center has conducted tests to measure spatial warpage and temporal instability in the Loran-C hyperbolic navigation grid. Airborne Loran-C calibration requirements identified from the test data are discussed in this report. The test results have been obtained in support of the Federal Radionavigation Plan decision process. Test emphasis is placed on non-precision approach, the flight phase for which FAA Advisory Circular AC-90-45A accuracy requirements are most stringent. Spatial warpage is assessed using Time Difference (TD) data collected at approximately 25 sites within 20 km of each of five airports. It is found that the Loran-C TD bias is the dominant warpage component and that the bias must be calibrated to meet AC-90-45A requirements for certain airports and station triads. An alternative but less accurate method than bias calibration makes use of propagation models based on mixed land/sea signal paths. Temporal instability is assessed using TD data collected over two-to-three week periods at each airport and over an entire year at a fixed-site monitor at London, KY. It is concluded that short-term instability is negligible, but seasonal instability is potentially a problem for certain regions and triads
Standardization Potential Across Navigation Systems (SPANS)( Book )

1 edition published in 1977 in English and held by 1 WorldCat member library worldwide

The objective of the SPANS effort is to assess the potential for standardization across avionic navigation systems by identifying standard hardware and software configurations that minimize life-cycle costs while satisfying Air Force operational requirements. The primary output of the effort is a computerized Standardization Evaluation Program (STEP) that quantifies the impact of standardization in those areas of avionics (such as navigation) defined by the program data base. The methodology uses a life-cycle cost model in an iterative manner over a number of aircraft and their associated mission profiles. The life cycle cost model is sensitive to the cost benefits, obtained by widespread use of standard equipment across several aircraft, through cost learning and reliability improvement functions. The SPANS data base consists of three files, including aircraft/mission data, navigation subsystem data and standard cost factors data, that provide the inputs necessary for operation of the STEP program
A unified approach to mapping, charting and geodesy (MC & G) data base structure design by William K Sharpley( Book )

1 edition published in 1978 in English and held by 1 WorldCat member library worldwide

This is the final report for an investigation of a possible unified approach to Mapping, Charting and Geodesy (MC and G) data base structure design. The purposes of this investigation were to analyze the implications of various image archive structures in support of MC and G production and to demonstrate the potential value of recent results in Topological Data Base structures in MC and G applications. This report presents the results of the investigation. It includes analysis of the merits and deficiencies of the various approaches and the results of an experimental application of Topological Data Base Structuring principles in an example MC and G data base processing problem. (Author)
Validation of High Angle-of-Attack Analysis Methods( Book )

1 edition published in 1979 in English and held by 1 WorldCat member library worldwide

This report extends, applies, and validates the aircraft stability and control methodologies developed by TASC and reported in ONR-CR-215-237-2. These methodologies enable the prediction of airframe stability boundaries, control and power difficulties, and stability boundaries of the combined pilot, control system, and aircraft. In the realm of control system design, these methods enable the construction of digital command augmentation systems which provide precise command response over the entire flight regime while augmenting the airframe stability characteristics. The design of an air combat digital flight control system for the F-14A is described in this report, and its performance is verified by the use of a nonlinear six-degree-of-freedom aircraft simulation and an air combat pilot model. Comparison of the tracking accuracy of the DFCS-aircraft to that of a conventionally controlled aircraft indicates that the DFCS provides better tracking and reduces the likelihood of control-induced departure. In the realm of pilot model validation, a method of choosing the best model among those hypothesized is described and its operation demonstrated. Piloted simulation data are processed which indicate that the pilot does not change his control strategy to correspond to changes in the aircraft flight condition
Data Smoothing for Enhancement of Strapdown Inertial System Accuracy: Interpolative-Predictive Algorithms( Book )

1 edition published in 1969 in English and held by 1 WorldCat member library worldwide

A novel approach to computing the attitude transformation matrix of a strapdown inertial system is investigated. While related to prior techniques which recover angular rate information and integrate the attitude matrix differential equation, this approach intentionally delays the angular rate calculations in order to incorporate 'future' gyro outputs. It is demonstrated that the ensuing delays in calculation of position and velocity do not cause significant navigation errors and that the subject technique gives generally superior attitude-keeping performance over a wide range of conditions. (Author)
Integration Technology Program( Book )

1 edition published in 1975 in English and held by 1 WorldCat member library worldwide

The Integration Technology Program has focused attention on the complex issues associated with the integration of aircraft multisensor (or hybrid) navigation systems. A digital computer is the central element of a typical multisensor integrated navigation system. The computer performs the 'dedicated' data processing specifically related to individual sensors and displays, plus the processing of algorithms required to make the individual sensors play together, i.e., the sensor integration computations. The Integration Technology Program has placed maximum emphasis on the problems associated with the design of these sensor integration algorithms
Multimode Signal Prediction Algorithm Development( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

This report presents a computationally-efficient algorithm based on full-wave waveguide-mode theory for predicting amplitude, phase, and modal interference-induced phase deviation (MIPD) of an Omega station signal for a given location and time. The signal along a path is approximated by a sum of the signal's first few, strongest-amplitude modes propagating in the earth- ionosphere waveguide formed along the signal path. An inhomogeneous signal path is modeled as a concatenation of a large number of homogeneous segments. For each segment, the algorithm determines the eigenvalue of each of the selected component modes of the multimode signal. The multimode signal propagation across the segment interfaces is determined by connecting the neighboring segment's mode signals using the IPP model's WKB approximation if the mode eigenvalues vary slowly across the interface; otherwise, using the FASTMC model's mode conversion approach. The resulting algorithm provides a reliable and cost- effective prediction of amplitude, phase and MIPD of an Omega stations signal for a given location and time. Keywords: Omega navigation system. (KR)
New Approach to Omega PPCs (Propagation Corrections)( Book )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

The currently available propagation correction (PPC) model algorithm maintained by the U.S. Coast Guard Omega Navigation System Center was developed in 1980. Although an improvement over the earlier 1974 algorithm, the 1980 PCC model exhibits a number of deficiencies. To correct these deficiencies, a new approach to modeling PPCs is presented. This model incorporates semi-empirical forms directly into the time-dependent portions of the model, thus insuring that the PPC predictions are directly data-driven and data collected during path transition conditions may be used for model calibration. A geomagnetic conductivity sub-model is described which provides effective phase velocity and excitation factor phase functional forms for day or night path segments with given geomagnetic bearing, geomagnetic latitude, and ground conductivity. This sub-model describes all space-dependent quantities (on which phase depends) except for the spatially anomalous ionospheres of the auroral and polar regions. A diurnal sub-model is described in which the diurnal phase behavior on a propagation path is treated as a sum of discrete phase changes on path segments having ionospheric reflection heights determined from classical Chapman photoionization models. In addition, onset and recovery times for sunrise and sunset are characterized by several parameters which can be adjusted to fit observed data. (rrh)
Fault-Tolerant System Analysis: Imperfect Switching and Maintenance( Book )

1 edition published in 1987 in English and held by 1 WorldCat member library worldwide

This final report presents the results of research into two important areas of concern for fault-tolerant avionics systems: testability analysis and innovative repair policies. The algorithms developed from this research have been included in the Mission Reliability Model (MIREM) and verified by comparison with known results from several Integrated Communication, Navigation, and Identification Avionics architectures. The purpose of the testability analysis was to develop techniques for assessing the impact of imperfect switching on the overall reliability of fault-tolerant avionics. A method of quantifying the effects of undetected errors and false alarms has been developed and included in MIREM. Under the next phase of the program, three repair statistics were identified: Mean Time To Repair, Mean Time Between Maintenance Actions, and Inherent Availability. These were used to define four alternative repair policies: immediate repair, deferred repair, scheduled maintenance, and repairat degraded level. Also included in MIREM as model outputs, these four options offer greater flexibility in evaluating and developing avionics designs
Omega System Performance Assessment and Coverage Evaluation (PACE) Workstation Design and Implementation. Volume 1( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

The Performance Assessment and Coverage Evaluation (PACE) workstation is a microcomputer-based tool to assist Omega Navigation System Center personnel in answering questions regarding Omega system performance. The workstation implements a probabilistic model of Omega system availability for user-selected coverage and other criteria. This memorandum provides information on the design and implementation of the PACE workstation software
The Weapons Support System Data Smoothing and Spectrum Analysis Program Documentation by J. V White( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

This report documents the four programs, GETBELL, AR, FFT, and PLOTFFT, which make up the data smoothing and spectrum analysis software supplied with the Weapons Support System. The programs are designed to run under the VAX/VMS operating system. Information regarding file structures and file-naming conventions is provided in the VAX/VMS System Reference Manuals. Keywords include: Gravity, Gravity Data Evaluation, Weapons Support System, Data Editing, Data Smoothing, Spectrum Analysis, Autoregressive Modeling
Omega/VLF Signal Coverage Database Development( Book )

1 edition published in 1991 in English and held by 1 WorldCat member library worldwide

The PACE (Performance Assessment and Coverage Evaluation) workstation used for Omega system performance analysis incorporates a 24-hour/4month/2-frequency/cell-format Omega system signal coverage database. PACE uses this database, in addition to other databases, to compute expected availability of the Omega system using 10.2 and/or 13.6 kHz Omega signals in a specified geographic region at a specified time (UT hour and month). The signal coverage database contains the signal coverage elements needed to establish usability/non-usability of the 10.2/13.6kHz Omega signals at a given location (cell) and time. This report describes the methodology used to generate the Omega signal covering database. In addition, the report presents candidate approaches, including the associated labor/computer resources, that could be used to generate a modal-signal database for the VLF Communications Network station
The Weapons Support System Multisensor Simulation Software Program Documentation( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

The multisensor simulation software is designed to analyze the effects of multisensor surveys of the gravity field on gravimetric estimation errors and weapon system performance. The analysis methodology on which this soft-ware is based was developed by TASC for the Air Force Geophysics Laboratory and the Defense Mapping Agency. The program is ideally suited for the design of multisensor surveys to achieve a desired level of accuracy in gravity recovery or weapon system performance. (Author)
Legacy Software Re-Engineering Technology (LSRET)( )

1 edition published in 1998 in English and held by 1 WorldCat member library worldwide

This Final Report documents the state of the Legacy Software Reengineering Technology (LSRET) Prototype Project at the time it was halted. The technology developed by TASC under the LSRET program was to be used to assist in the reengineering of avionics software. The RET was designed to process FORTRAN and JOVIAL code, and generate Ada code. The RET was also designed to be extensible to other High Order Languages. Much of the existing avionics software is poorly documented for maintenance purposes. LSRET was being developed to support engineers in transforming the legacy code into a more modern programming language and also to be used to (re)document either the legacy or the reengineered systems. This would improve the maintainability of the avionics software in two ways. LSRET could reengineer the software into a language that promotes better software engineering practices; and also makes it easier to find engineers who are trained in the use of the newer language. Second, LSRET could redocument the legacy and reengineered systems making them easier to maintain in the future
 
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English (28)